<template>
  <div>
    <!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
<!--    卡片视图区域-->
    <el-card>
<!--      头部警告区域-->
      <el-alert title="注意: 只允许为第三级分类设置相关参数！"
                type="warning" :closable="false"
                show-icon>

      </el-alert>
<!--      选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类: </span>
<!--          选择商品分类的级联选择框-->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="{ expandTrigger: 'hover',
            value:'cat_id',label:'cat_name',children:'children' }"
            @change="handleChange"></el-cascader>

        </el-col>
      </el-row>
<!--      tabs页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--        添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
<!--          添加参数的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
<!--          动态参数表格-->
          <el-table :data="manyTableData" border stripe>
<!--            展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
<!--                循环渲染tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
<!--                输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
<!--                添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteParams(scope.row)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
<!--        添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
<!--          添加属性的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!--         静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--            展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--                循环渲染tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!--                输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--                添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteParams(scope.row)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
<!--    添加参数的对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
<!--      添加参数的对话框-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
    </el-dialog>
    <!--    编辑参数的对话框-->
    <el-dialog
      :title="'编辑'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <!--      添加参数的对话框-->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 这是被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData :[],
      // 控制添加对话框是否显示
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {},
      //添加表单的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 编辑表单的数据对象
      editForm: {},
      // 编辑表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制编辑对话框是否显示
      editDialogVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList(){
      const {data: res} = await this.$http.get("/categories")
      if (res.meta.status !== 200){
        return this.$message.error("获取商品分类失败！")
      }
      this.catelist = res.data
      // console.log(res.data)
    },
    //级联选择框选中项变化会触发
    handleChange(){
      this.getParamsData()
    },
    // tabs页签点击事件处理函数
    handleTabClick(){
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData(){
      if (this.selectedCateKeys.length !== 3){
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const {data: res} = await this.$http.get("/categories/" + this.cateId + "/attributes", {params: {sel: this.activeName}})
      if (res.meta.status !== 200){
        return this.$message.error("获取参数列表失败！")
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many'){
        this.manyTableData = res.data
      }else {
        this.onlyTableData = res.data
      }
    },
    //监听对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.post("/categories/" + this.cateId + "/attributes", {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201){
          return this.$message.error("添加参数失败！")
        }
        this.$message.success("添加参数成功！")
        this.addDialogVisible = false
        await this.getParamsData()

      })
    },
    // 控制编辑对话框是否显示
    async showEditDialog(row){
      const {data: res} = await this.$http.get("/categories/" + row.cat_id + "/attributes/" + row.attr_id)
      if (res.meta.status !== 200){
        return this.$message.error("获取参数信息失败！")
      }
      this.editForm = res.data
      console.log(this.editForm)
      this.editDialogVisible = true
    },
    // 点击确定按钮，进行编辑
    editParams(){
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.put("/categories/"+this.editForm.cat_id+"/attributes/"+this.editForm.attr_id,{attr_name: this.editForm.attr_name,attr_sel: this.activeName})
        if (res.meta.status !== 200){
          return this.$message.error("编辑参数失败！")
        }
        this.$message.success("编辑参数成功！")
        await this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 监听编辑对话框的关闭事件
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击删除按钮，进行删除
    async deleteParams(row){
      // console.log(row.cat_id)
      // console.log(row.attr_id)
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm'){
        return this.$message.info("已取消删除！")
      }
      // 删除的业务逻辑
      const {data: res} = await this.$http.delete("/categories/" + row.cat_id + "/attributes/" + row.attr_id)
      if(res.meta.status !== 200){
        return this.$message.error("删除参数失败！")
      }
      this.$message.success("删除参数成功！")
      await this.getParamsData()
    },
    // 文本框失去焦点，或摁下了Enter都会触发
    async handleInputConfirm(row){
      if (row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      await this.saveAttrVals(row)

    },
    //将对attr_vals的操作保存到数据库中
    async saveAttrVals(row){
      // 需要发起请求，保存这次操作
      const {data: res} = await this.$http.put("/categories/" + this.cateId + "/attributes/" + row.attr_id, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(" ")
      })
      if (res.meta.status !== 200){
        return this.$message.error("修改参数项失败！")
      }
      this.$message.success("修改参数项成功！")
    },
    // 点击按钮，显示文本输入框
    showInput(row){
      row.inputVisible = true
      // 让文本框自动获得焦点，$nextTick方法的作用是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClosed(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }

  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled(){
      if (this.selectedCateKeys.length !== 3){
        return true
      }
      return false
    },
    // 当前选中的三级分类Id
    cateId(){
      if (this.selectedCateKeys.length === 3){
        return this.selectedCateKeys[2]
      }
      return null

    },
    // 动态计算标题的文本
    titleText(){
      if (this.activeName === 'many'){
        return '动态参数'
      }
      return '静态属性'
    }

  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px;
}
.input-new-tag {
  width: 120px;
}
</style>
